Would you like to send letters in TMW?

Why not have a TMW post office?
Maybe a building where you can go in and buy paper and seals and then edit your letter and
talk to an NPC to send it to a player. Maybe even a mailbox icon?
Maybe the mailbox icon will be full of letters sent by friends?
And maybe even a quest to be able to have the mailbox icon and to send letters?
Maybe have a rule on the letter when you write it?

1. Do not put anything threatening in the letter

That's all I could think of.
And maybe take a screen shot of the letter and post it here?

Dawn's original proposal for sending items/money made considerable sense to me (though it risks players abusing the post office as a `mule', particularly if provided as a free service). Dimond's proposed extension of also permitting text makes sense in this context, however: (1) the tmw message board already provides private messaging functionality, (2) implementing the neccessary functionality in tmw's client and server would be nontrivial, as the required components are

(a) client-side general purpose text editor
(b) server-side storage of arbitrary text for arbitrary periods of time
(c) instance-specific attributes (index into text db) for items (I am still not sure whether these are or are not provided by eathena at this point).

If persistent (!) in-game messages are to be provided, perhaps it would be easier to connect tmwserv with the message boards, to allow players to read their mail in-game (whilst requiring private messages to be written on the message board). At the very least this would permit a more gradual implementation and duplicate fewer resources.

I agree, a postoffice would be awesome. Ofcourse you can have in-game mail system or use the board... but hey, we're role-playing here! Besides not everyone in the game is on the board.

A post-office fitst perfectly in the virtual world concept. The only important thing would be that you actually need to visit a postoffice in order to get your mail. Or... it might be that we need a postman, who walks around and gives people their mail. That would be cool...

Also the letter system could be used to send items to players that are on the other side of the world. Just like princess Peach Toadstool did.
I think letters and packages should be picked up at a post office. If a player could instantly send 10 new potions to a fellow party member that is in the middle of battle that would be too big an advantage. If there's mail for you there should be a notification telling you so.

You could use actual building sites as Post Offices... or you could use a simpler system to send packages: mailboxes. That may be too World of Warcraft but it's an effective system. Hit up a mailbox, enter in the name of the recipient, subject and body of the letter and attach any items you want (within reason, WoW didn't allow Soulbound items for instance to be sent through mail or quest specific items, etc.), poerhaps money, hit send and off it goes. Only cost 30 copper for a simple letter, more depending on what items you were sending. This could be adapted so that 'shipping' costs are calculated on an item-weight basis.